AWS SQS (FIFO) trigger lambda if its not in running state

Question

I want to trigger a AWS lambda from SQS (FIFO), which is successfully done, but according to my use case there will be multiple tenants with there own SQS FIFO queue, for the multiple tenants there will be only one lambda which will be triggered from SQS.

lets say if we have 2 tenants T1 and T2, if the T1 have 2 request which must trigger the lambda for the 1st request the 2nd request should wait for the completion of the 1st one, at the same time for the tenant T2 will have 2 request it should trigger the lambda for the 1'st request and the 2'nd request should wait.

in short for the different tenants queue's request should trigger the lambda simultaneously for there individual request, other request should wait in the queue

Thanks in advance

Answer 1

If you want only a single lambda function processing your SQS msg, then you can set your function's reserved concurrency to 1:

Reserved concurrency guarantees the maximum number of concurrent instances for the function. When a function has reserved concurrency, no other function can use that concurrency.